Can Tire currently has UPMs (power monitor) on sale. They kind of look like the larger digital timers that plug directly into the wall. Don't know how accurate they are but they're designed to monitor the usage of your larger appliances. You can monitor different parameters such as wattage, amps, etc. and if you know what your paying per kilowatt hour, you can even input that information. It will then calculate the cost per kilowatt hour of the appliance you have it hooked up to. Less than $20.00
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